Ocean acoustic sensor installation at the South Florida Ocean Measurement Center

Hien B. Nguyen, Harry A Deferrari, Neil J. Williams, William A. Venezia

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A tri-axial array of acoustic hydrophones has recently been installed off the South Florida coast in 145 m of water. The installation is one of a number of projects that have begun making use of the new South Florida Ocean Measurement Center facilities in Dania, FL. The arrays are linked to shore via a fiber-optic cable and powered from shore with a separate insulated copper cable. Two of the arms of the array are deployed on the bottom to the east and south of the origin. The third array is a sub-surface vertical mooring which includes a pressure sensor to monitor the depth of the top buoy. Each axis contains 32 hydrophones spaced in a nonlinear distribution to facilitate acoustic coherence measurements. Other sensor configurations are possible, including the replacement of hydrophones with other instruments such as current meters or temperature, pressure, or conductivity sensors. Small projectors are placed at the base of the vertical array and at the ends of the horizontal arrays, making it possible to determine the location of each sensor in real time via time-of-flight measurements. Computers running the Linux operating system control the projectors and process data from each leg of the array. Each of the three computers is connected via fiber-optic lines to a Fast Ethernet switch box and networked to shore. The computers can be accessed via TCP/IP connections and programmed from shore to suit new missions. A wireless link to the Nova Southeastern University network and the Internet makes it possible to access the system and conduct experiments from anywhere in the world. The current mission of this system is to study the coherence of shallow-water acoustic propagation. However, knowledge gained here will facilitate a variety of future projects-which include active and passive sonars, ambient noise study, high-frequency acoustic monitoring of fish migration, and acoustic tomographic monitoring of the Gulf Stream. Excellent data were obtained from several experiments. At the present time, only the vertical array is working but plans to restore the two horizontal arrays are actively pursued.

Original languageEnglish (US)
Pages (from-to)235-244
Number of pages10
JournalIEEE Journal of Oceanic Engineering
Volume27
Issue number2
DOIs
StatePublished - Apr 2002

Fingerprint

acoustics
Acoustics
Hydrophones
sensor
Sensors
ocean
hydrophone
fiber optics
Optical cables
Monitoring
Mooring
Computer operating systems
Pressure sensors
cable
Ethernet
Acoustic noise
Fish
Fiber optics
Telecommunication links
Coastal zones

Keywords

  • Acoustic signal processing
  • Nonuniformly spaced arrays
  • Remote sensing
  • Underwater acoustic arrays
  • Underwater acoustic measurements
  • Underwater acoustic propagation

ASJC Scopus subject areas

  • Oceanography
  • Civil and Structural Engineering
  • Electrical and Electronic Engineering
  • Ocean Engineering

Cite this

Ocean acoustic sensor installation at the South Florida Ocean Measurement Center. / Nguyen, Hien B.; Deferrari, Harry A; Williams, Neil J.; Venezia, William A.

In: IEEE Journal of Oceanic Engineering, Vol. 27, No. 2, 04.2002, p. 235-244.

Research output: Contribution to journalArticle

Nguyen, Hien B. ; Deferrari, Harry A ; Williams, Neil J. ; Venezia, William A. / Ocean acoustic sensor installation at the South Florida Ocean Measurement Center. In: IEEE Journal of Oceanic Engineering. 2002 ; Vol. 27, No. 2. pp. 235-244.
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